
1) Celtic Britons 2) Historical Celtic people
Found on
https://www.crosswordclues.com/clue/segontiaci

The Segontiaci were a tribe of Iron Age Britain encountered by Julius Caesar during his second expedition to Britain in 55 BC. They surrendered to him as he was campaigning against Cassivellaunus in the Thames Valley, which suggests they were also based in the south-east. However a Roman fort in north Wales, near the River Seiont, was called Segon...
Found on
http://en.wikipedia.org/wiki/Segontiaci
No exact match found.